If the chemical turns black/purple, this indicates the presence of MDMA, MDA, MDE, or DXM. If the pill contains DXM, the color change will take 5 seconds or so, MDMA-like substances should change color instantly. The reagent will also react this way in the presence of opiates, which are never used as ecstasy adulterants (this wouldn't be cost efficient). A new testing reagent is now being used to differentiate between MDMA and DXM more clearly; it is called the Mecke reagent (green/black in the presence of MDMA, yellow with DXM, orange/purple for 2C-T-7)

If the chemical turns bright yellow or green, 2CB, DOM, or DOB are present.

If the chemical turns bright orange, amphetamines (speed) are present.